| 1 | M & D Oil & Gas | Levelland, TX 79336 | Oil & Gas Operator | Aug 2000 |
| 2 | M.B.J. Operating | Argyle, TX 76226 | Oil & Gas Operator | Jun 2022 |
| 3 | Mammoth Exploration LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2023 |
| 4 | Manzano LLC | Roswell, NM 88202 | Oil & Gas Operator | Oct 2025 |
| 5 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 6 | Masada Development Company | Lubbock, TX 79416 | Oil & Gas Operator | Nov 2021 |
| 7 | Matador Operating, LLC | Lubbock, TX 79413 | Oil Operator | Oct 2024 |
| 8 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2025 |
| 9 | McBee Company, The | Dallas, TX 75219 | Oil & Gas Operator | Dec 1997 |
| 10 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 11 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 12 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | Oct 2025 |
| 13 | Melton, Joe, DRLG. Co., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 14 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 15 | Meridian Exploration Corp. | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2021 |
| 16 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 17 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 18 | Mid Texas Natural Gas | Kyle, TX 78640 | Oil & Gas Operator | May 2019 |
| 19 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 20 | Miltex Oil Company | Boerne, TX 78006 | Oil & Gas Operator | Oct 2025 |
| 21 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Oct 2025 |
| 22 | Miocene Oil & Gas, LTD. | Englewood, CO 80110 | Oil & Gas Operator | Oct 2025 |
| 23 | Miranda Energy Corporation | Midland, TX 79705 | Oil & Gas Operator | Jun 2016 |
| 24 | MJ Oil Company | Minerva, OH 44657 | Oil & Gas Operator | Dec 2008 |
| 25 | MJB Production Company, Inc. | Brownfield, TX 79316 | Oil & Gas Operator | Oct 2025 |
| 26 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | Jul 2025 |
| 27 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 28 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 29 | Momentum Energy Corporation | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 30 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 31 | Monadnock Resources Op Co, LLC | Dallas, TX 75209 | Oil & Gas Operator | Jan 2021 |
| 32 | Monadnock Resources, LLC | Addison, TX 75001 | Oil & Gas Operator | May 2020 |
| 33 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2025 |
| 34 | Montex Drilling Company LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 35 | Moss Petroleum Company | Dallas, TX 75207 | Oil & Gas Operator | Oct 2025 |
| 36 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 37 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 38 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |